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Honors Biology Chapter 7Section 3 Cell Boundaries.

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Presentation on theme: "Honors Biology Chapter 7Section 3 Cell Boundaries."— Presentation transcript:

1 Honors Biology Chapter 7Section 3 Cell Boundaries

2  surround all cells  is a thin, flexible barrier that acts like the cell’s “gate keeper”  made of lipid-bilayer  provides protection & support

3  Fluid Mosaic Model  phospholipids

4  resembles an ever-moving sea of fluid lipids that has large proteins bobbing along throughout the lipids

5 1. Phospholipids (~70% of membrane) 2. Cholesterol:  changes fluidity of membrane 3. Glycolipids  sugar molecule on lipid

6  Integral Proteins  go all the way thru the membrane  channel proteins  receptor proteins  Peripheral Proteins  on inside or outside of membrane  +/- attached to integral proteins

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8  found in:  plant cells  fungi cells  algae  bacteria  secreted by cell membrane  allow O 2, CO 2, glucose, & H 2 O to pass through

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